Oneself, Myself, Self
pronoun, の adjective
One’s self part is, after everything, still oneself. And the part that’s from my self is, well, myself. Everyone has their own part of their self. Pretty straightforward.
じぶん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
男は自分だけだった。
I was the only man there.
この木、自分で切ったの？
Did you cut this tree yourself?
自分のお皿は自分で下げて下さい。
Please clear your own plates yourself.